Baghdad, Iraq (CNN) -- An attack on apartments that neighbors say were used as a brothel in Baghdad killed at least 28 women and six men Saturday, security officials told CNN.

An AFP correspondent on the scene reported that the attackers left a message on a door: "This is the fate of any prostitution."

Unidentified militants wearing military uniforms and street clothes stormed several apartments in the Zayona residential complexes in eastern Baghdad, officials said. They fired their weapons in the streets before breaking down doors to enter the buildings, security officials and residents told CNN. Once inside, they killed the men and women, the officials said.

Residents told CNN the Shiite Asa'b Ahl al-Haq organization carried out the attack. But the organization told CNN it does not have forces inside the city.

Baghdad, Iraq (CNN) -- An attack on apartments that neighbors say were used as a brothel in Baghdad killed at least 28 women and six men Saturday, security officials told CNN.

An AFP correspondent on the scene reported that the attackers left a message on a door: "This is the fate of any prostitution."

Unidentified militants wearing military uniforms and street clothes stormed several apartments in the Zayona residential complexes in eastern Baghdad, officials said. They fired their weapons in the streets before breaking down doors to enter the buildings, security officials and residents told CNN. Once inside, they killed the men and women, the officials said.

Residents told CNN the Shiite Asa'b Ahl al-Haq organization carried out the attack. But the organization told CNN it does not have forces inside the city.